No bike option

I love playing Pokémon and I use the new watch app. Theres a problem whenever I ride my bike. I open the app and start a workout. I turn off the auto shut-off option in my phones settings to keep the app open during riding. But at the end of every single ride, I find out that the "Im a passenger" message popped up and paused my workout 3 miles back. In other words, how do you remove the "Im a passenger" option. Please introduce a "bike mode" that will not pause my workout. Please make it easier to prevent the "Im a passenger" message from appearing at all. This is extremely frustrating and will cause me to abandon using the app. Thank you.

maconvelli about Pokémon GO, v1.31.0